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    CVE-2026-63750

    SurrealDB versions before 3.1.0 fail to apply the SURREAL_WEBSOCKET_MAX_MESSAGE_SIZE limit to anonymous /sql WebSocket connections, allowing attackers to buffer unbounded frames in the per-connection read buffer. Attackers can stream WebSocket frames larger than the configured limit across multiple concurrent connections to consume excessive memory and degrade /sql availability.

    Published:Jul 20, 2026
    Last Modified:Jul 28, 2026
    EPS:Jul 20, 2026
    EPSS Score:0.00278
    CVSS Score:5.3

    Affected Products

    Vendor
    Surrealdb
    Product
    Surrealdb

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-63763 (CVSS 7.5) — SurrealDB before 2.5.0 and before 3.0.0-beta.3 contains a confused deputy privilege escalation vulnerability. …
    CVE-2026-63762 (CVSS 6) — SurrealDB before v2.6.1 (and before v3.0.0-beta.3) contains a denial of service vulnerability in its embedded …
    CVE-2026-63761 (CVSS 5.3) — SurrealDB before 3.1.0 silently substitutes the ES384 algorithm when a JWT access method is configured with AL…
    CVE-2026-63760 (CVSS 8.7) — SurrealDB before 3.1.0 fails to enforce the configured recursion depth limit in the value and JSON parser when…
    CVE-2026-63759 (CVSS 7.1) — SurrealDB before 3.1.0 fails to enforce recursion depth limits in the type/kind parser when processing nested …
    CVE-2026-63758 (CVSS 5.3) — SurrealDB versions before 3.1.0 contain an authorization bypass vulnerability in the KILL statement that allow…
    CVE-2026-63757 (CVSS 8.7) — SurrealDB versions before 3.1.0 contain a session hijacking vulnerability where the HTTP /rpc sessions method …
    CVE-2026-63756 (CVSS 9.2) — SurrealDB versions before 3.1.0 contain a time-of-check/time-of-use race condition in the HTTP /rpc endpoint t…
    CVE-2026-63755 (CVSS 7.1) — SurrealDB before 3.1.0 evaluates user-supplied WHERE clauses in SELECT statements (and SET/MERGE/CONTENT/PATCH…
    CVE-2026-63754 (CVSS 7.1) — SurrealDB versions before 3.1.0 contain a denial of service vulnerability where malicious LIVE queries with WH…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High